fastboot: Reuse the Galaxy Nexus phone's VID/PID by default

Reuse the VID/PID of the Galaxy Nexus phone for boards that don't have
an official one.

Also correct smaug's PID.

BUG=b:63407238
TEST=build and boot

Change-Id: Id8b0f2bb462b4e6a8cb93fa69d171066be7e6860
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Reviewed-on: https://chromium-review.googlesource.com/706751Reviewed-by: Julius Werner <jwerner@chromium.org>

board/foster/defconfig

@@ -41,5 +41,3 @@ CONFIG_DRIVER_VIDEO_TEGRA132=y
 
 # Fastboot
 CONFIG_FASTBOOT_MODE=y
-CONFIG_FASTBOOT_USBVID=0x18d1
-CONFIG_FASTBOOT_USBDID=0x4e30

board/smaug/defconfig

@@ -46,6 +46,5 @@ CONFIG_DRIVER_VIDEO_TEGRA210=y
 
 # Fastboot
 CONFIG_FASTBOOT_MODE=y
-CONFIG_FASTBOOT_USBVID=0x18d1
-CONFIG_FASTBOOT_USBDID=0x4e30
+CONFIG_FASTBOOT_USBPID=0x5201
 CONFIG_BCB_SUPPORT=y

src/fastboot/Kconfig

@@ -20,13 +20,19 @@ config FASTBOOT_MODE
 
 config FASTBOOT_USBVID
 	hex "Fastboot USB Vendor ID"
-	default 0x0
+	default 0x18d1
 	depends on FASTBOOT_MODE
+	help
+	  The default is 0x18d1(Galaxy Nexus phone), for boards that don't have
+	  an official one.
 
-config FASTBOOT_USBDID
-	hex "Fastboot USB Vendor ID"
-	default 0x0
+config FASTBOOT_USBPID
+	hex "Fastboot USB Product ID"
+	default 0x4e30
 	depends on FASTBOOT_MODE
+	help
+	  The default is 0x4e30(Galaxy Nexus phone), for boards that don't have
+	  an official one.
 
 config FASTBOOT_EP_IN
 	int "In-Endpoint to use for fastboot"

src/fastboot/udc.c

@@ -31,7 +31,7 @@ static device_descriptor_t device_descriptor = {
 	.bDeviceProtocol = 0,
 	.bMaxPacketSize0 = 64,
 	.idVendor = CONFIG_FASTBOOT_USBVID,
-	.idProduct = CONFIG_FASTBOOT_USBDID,
+	.idProduct = CONFIG_FASTBOOT_USBPID,
 };
 
 /* Length of OUT transfer. Because these transfers